Propitiation of Ketu (Thursday)CHARITY:Donate a brown cow with white spots, colored blankets, or a dog to a poor young man on Thursday.FASTING:On the first Thursday of the waxing moon, especially during major or minor Ketu periods.MANTRA:To be chanted on Thursday at midnight, especially during major or minor Ketu periods:

Cat’s Eye Chrysoberyl is the gemstone for KetuRESULT:The planetary diety Ketu is propitiated granting victory over enemies, favour from the King or government, and reduction in diseases caused by Ketu.

Ketu is not really a planet, but rather a mathematically calculated point in the heavens. Because of its lack of a "body" it represents uncertain, unexpected and unpredictable phenomena. It is intelligent and relates to mathematics and other abstract knowledge.

Rahu and Ketu are one together. According to 'Shri Bhagwat Puran', the nectar pitcher was one of the things that came out of the sea after it was churned. When the gods and demons clashed to get the nectar , Lord 'Vishnu' formed himself as the most attractive and charming woman Mohini who started to distribute or feed nectar to both of them. A learned demon Rahu, the son of Viparchitti and Shimica saw that Lord Vishnu in the garb of Mohini, was not practicing honesty. He was infact giving nectar to the gods and wine to the demons. Then he (Rahu) sat among gods in the garb of a god. As soon as he drank the nectar, the Moon and the Sun saw that the demon sitting among them was Rahu. They informed Lord Vishnu who chopped off the neck of the demon but he had become immortal after drinking the nectar. Therefore, both pieces of Rahu ,his head and his remaining body became two separate demons. The head was named Rahu and the remaining body as Ketu. Rahu and Ketu were thrown in opposite directions by the Lord Vishnu

Ketu's sign of the zodiac is Pisces. But in reality it is the sign of Jupiter which is also shared by Ketu. The gem of the planet Ketu is Cat's eye.